Equity (Details) - USD ($)			1 Months Ended	12 Months Ended				90 Months Ended
	Feb. 05, 2020	Feb. 13, 2018	Feb. 28, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2014	Dec. 31, 2019	Oct. 04, 2019
Class of Stock [Line Items]
Preferred stock authorized, shares (in shares)				500,000,000				500,000,000
Par value of preferred stock, per share (in dollars per share)				$ 0.01				$ 0.01
Preferred stock outstanding, shares (in shares)				0				0
Amount authorized for stock repurchase									$ 3,000,000,000
Cumulative authorized amount								$ 15,000,000,000
Repurchase of common stock, shares (in shares)				16,865,000	47,961,000	18,738,000		153,968,191
Cost of shares repurchased				$ 1,650,000,000	$ 4,645,000,000	$ 1,590,000,000		$ 12,000,000,000
Number of shares authorized to be repurchased (in shares)			35,000,000
Repurchase of common stock			$ 3,280,000,000	$ 1,650,000,000	$ 4,645,000,000	$ 1,590,000,000
Accelerated share repurchases, initial price paid per share (in dollars per share)		$ 93.725
Subsequent Event
Class of Stock [Line Items]
Quarterly cash dividend declared (in dollars per share)	$ 0.90
Share exchange—PSPI transaction
Class of Stock [Line Items]
Repurchase of common stock, shares (in shares)							17,422,615
Cost of shares repurchased							$ 1,350,000,000
Cash and cash equivalents
Class of Stock [Line Items]
Share repurchase settlement amount			1,880,000,000
Commercial Paper | Cash and cash equivalents
Class of Stock [Line Items]
Share repurchase settlement amount			$ 1,400,000,000